black algae options to kill it.

photo2u

Well-known member
Jan 3, 2010
102
Claremont california
Hello,
I have a black algae problem. It has been getting better but the black little spots (1/4) inch will not go away.
This is what I have done:
1. Shock to 50 FC
2. Brushed with stainless steel brush
3. Emptied 30% of water from pool.
4. Ran to pump 24 hours for two days.
I am getting very frustrated but what should I do? Should I shock back to 50FC?
Please advice,

The details about my pool: PLASTER 30K NONE SALT WATER POOL IN GROUND /PH 7.4 CYA 80 /CURRENT FC 25/ ESTIMATED WATER VOLUME IN POOL IS ABOUT 18K GALLONS.
I thank you so much for any advice,
George from Claremont California.
 

dmanb2b

TFP Expert
LifeTime Supporter
Apr 4, 2009
3,734
NY
PH 6.4 :shock: is that a typo? If not you should raise it to 7.4 with borax asap. Are you sure it is BA? Try rubbin the affected area with a trichlor puck and see if it subsides, if so we'll know it's in fact organic and not metal staining.
 

photo2u

Well-known member
Jan 3, 2010
102
Claremont california
dmanb2b said:
PH 6.4 :shock: is that a typo? If not you should raise it to 7.4 with borax asap. Are you sure it is BA? Try rubbin the affected area with a trichlor puck and see if it subsides, if so we'll know it's in fact organic and not metal staining.

Yes, the 6.4 is a typo. The actual value is 7.4.

I will jump in to the pool and see if the actual black spots are BA.

Thanks for your help!

George